/*!
 * iScroll v4.2.2 ~ Copyright (c) 2012 Matteo Spinelli, http://cubiq.org
 * Released under MIT license, http://cubiq.org/license
 */
(function(window, doc){
    var m = Math,
    dummyStyle = doc.createElement('div').style,
    vendor = (function () {
	var vendors = 't,webkitT,MozT,msT,OT'.split(','),
	t,
	i = 0,
	l = vendors.length;

	for ( ; i < l; i++ ) {
	    t = vendors[i] + 'ransform';
	    if ( t in dummyStyle ) {
		return vendors[i].substr(0, vendors[i].length - 1);
	    }
	}

	return false;
    })(),
    cssVendor = vendor ? '-' + vendor.toLowerCase() + '-' : '',

    // Style properties
    transform = prefixStyle('transform'),
    transitionProperty = prefixStyle('transitionProperty'),
    transitionDuration = prefixStyle('transitionDuration'),
    transformOrigin = prefixStyle('transformOrigin'),
    transitionTimingFunction = prefixStyle('transitionTimingFunction'),
    transitionDelay = prefixStyle('transitionDelay'),

    // Browser capabilities
    isAndroid = (/android/gi).test(navigator.appVersion),
    isIDevice = (/iphone|ipad/gi).test(navigator.appVersion),
    isTouchPad = (/hp-tablet/gi).test(navigator.appVersion),

    has3d = prefixStyle('perspective') in dummyStyle,
    hasTouch = 'ontouchstart' in window && !isTouchPad,
    hasTransform = !!vendor,
    hasTransitionEnd = prefixStyle('transition') in dummyStyle,

    RESIZE_EV = 'onorientationchange' in window ? 'orientationchange' : 'resize',
    START_EV = hasTouch ? 'touchstart' : 'mousedown',
    MOVE_EV = hasTouch ? 'touchmove' : 'mousemove',
    END_EV = hasTouch ? 'touchend' : 'mouseup',
    CANCEL_EV = hasTouch ? 'touchcancel' : 'mouseup',
    WHEEL_EV = vendor == 'Moz' ? 'DOMMouseScroll' : 'mousewheel',
    TRNEND_EV = (function () {
	if ( vendor === false ) return false;

	var transitionEnd = {
	    ''			: 'transitionend',
	    'webkit'	: 'webkitTransitionEnd',
	    'Moz'		: 'transitionend',
	    'O'			: 'otransitionend',
	    'ms'		: 'MSTransitionEnd'
	};

	return transitionEnd[vendor];
    })(),

    nextFrame = (function() {
	return window.requestAnimationFrame ||
	window.webkitRequestAnimationFrame ||
	window.mozRequestAnimationFrame ||
	window.oRequestAnimationFrame ||
	window.msRequestAnimationFrame ||
	function(callback) {
	    return setTimeout(callback, 1);
	};
    })(),
    cancelFrame = (function () {
	return window.cancelRequestAnimationFrame ||
	window.webkitCancelAnimationFrame ||
	window.webkitCancelRequestAnimationFrame ||
	window.mozCancelRequestAnimationFrame ||
	window.oCancelRequestAnimationFrame ||
	window.msCancelRequestAnimationFrame ||
	clearTimeout;
    })(),

    // Helpers
    translateZ = has3d ? ' translateZ(0)' : '',

    // Constructor
    iScroll = function (el, options) {
	var that = this,
	i;

	that.wrapper = typeof el == 'object' ? el : doc.getElementById(el);
	that.wrapper.style.overflow = 'hidden';
	that.scroller = that.wrapper.children[0];

	// Default options
	that.options = {
	    hScroll: true,
	    vScroll: true,
	    x: 0,
	    y: 0,
	    bounce: true,
	    bounceLock: false,
	    momentum: true,
	    lockDirection: true,
	    useTransform: true,
	    useTransition: false,
	    topOffset: 0,
	    checkDOMChanges: false,		// Experimental
	    handleClick: true,

	    // Scrollbar
	    hScrollbar: true,
	    vScrollbar: true,
	    fixedScrollbar: isAndroid,
	    hideScrollbar: isIDevice,
	    fadeScrollbar: isIDevice && has3d,
	    scrollbarClass: '',

	    // Zoom
	    zoom: false,
	    zoomMin: 1,
	    zoomMax: 4,
	    doubleTapZoom: 2,
	    wheelAction: 'scroll',

	    // Snap
	    snap: false,
	    snapThreshold: 1,

	    // Events
	    onRefresh: null,
	    onBeforeScrollStart: function (e) {
		e.preventDefault();
	    },
	    onScrollStart: null,
	    onBeforeScrollMove: null,
	    onScrollMove: null,
	    onBeforeScrollEnd: null,
	    onScrollEnd: null,
	    onTouchEnd: null,
	    onDestroy: null,
	    onZoomStart: null,
	    onZoom: null,
	    onZoomEnd: null
	};

	// User defined options
	for (i in options) that.options[i] = options[i];
		
	// Set starting position
	that.x = that.options.x;
	that.y = that.options.y;

	// Normalize options
	that.options.useTransform = hasTransform && that.options.useTransform;
	that.options.hScrollbar = that.options.hScroll && that.options.hScrollbar;
	that.options.vScrollbar = that.options.vScroll && that.options.vScrollbar;
	that.options.zoom = that.options.useTransform && that.options.zoom;
	that.options.useTransition = hasTransitionEnd && that.options.useTransition;

	// Helpers FIX ANDROID BUG!
	// translate3d and scale doesn't work together!
	// Ignoring 3d ONLY WHEN YOU SET that.options.zoom
	if ( that.options.zoom && isAndroid ){
	    translateZ = '';
	}
		
	// Set some default styles
	that.scroller.style[transitionProperty] = that.options.useTransform ? cssVendor + 'transform' : 'top left';
	that.scroller.style[transitionDuration] = '0';
	that.scroller.style[transformOrigin] = '0 0';
	if (that.options.useTransition) that.scroller.style[transitionTimingFunction] = 'cubic-bezier(0.33,0.66,0.66,1)';
		
	if (that.options.useTransform) that.scroller.style[transform] = 'translate(' + that.x + 'px,' + that.y + 'px)' + translateZ;
	else that.scroller.style.cssText += ';position:absolute;top:' + that.y + 'px;left:' + that.x + 'px';

	if (that.options.useTransition) that.options.fixedScrollbar = true;

	that.refresh();

	that._bind(RESIZE_EV, window);
	that._bind(START_EV);
	if (!hasTouch) {
	    if (that.options.wheelAction != 'none')
		that._bind(WHEEL_EV);
	}

	if (that.options.checkDOMChanges) that.checkDOMTime = setInterval(function () {
	    that._checkDOMChanges();
	}, 500);
    };

    // Prototype
    iScroll.prototype = {
	enabled: true,
	x: 0,
	y: 0,
	steps: [],
	scale: 1,
	currPageX: 0, 
	currPageY: 0,
	pagesX: [], 
	pagesY: [],
	aniTime: null,
	wheelZoomCount: 0,
	
	handleEvent: function (e) {
	    var that = this;
	    switch(e.type) {
		case START_EV:
		    if (!hasTouch && e.button !== 0) return;
		    that._start(e);
		    break;
		case MOVE_EV:
		    that._move(e);
		    break;
		case END_EV:
		case CANCEL_EV:
		    that._end(e);
		    break;
		case RESIZE_EV:
		    that._resize();
		    break;
		case WHEEL_EV:
		    that._wheel(e);
		    break;
		case TRNEND_EV:
		    that._transitionEnd(e);
		    break;
	    }
	},
	
	_checkDOMChanges: function () {
	    if (this.moved || this.zoomed || this.animating ||
		(this.scrollerW == this.scroller.offsetWidth * this.scale && this.scrollerH == this.scroller.offsetHeight * this.scale)) return;

	    this.refresh();
	},
	
	_scrollbar: function (dir) {
	    var that = this,
	    bar;

	    if (!that[dir + 'Scrollbar']) {
		if (that[dir + 'ScrollbarWrapper']) {
		    if (hasTransform) that[dir + 'ScrollbarIndicator'].style[transform] = '';
		    that[dir + 'ScrollbarWrapper'].parentNode.removeChild(that[dir + 'ScrollbarWrapper']);
		    that[dir + 'ScrollbarWrapper'] = null;
		    that[dir + 'ScrollbarIndicator'] = null;
		}

		return;
	    }

	    if (!that[dir + 'ScrollbarWrapper']) {
		// Create the scrollbar wrapper
		bar = doc.createElement('div');

		if (that.options.scrollbarClass) bar.className = that.options.scrollbarClass + dir.toUpperCase();
		else bar.style.cssText = 'position:absolute;z-index:100;' + (dir == 'h' ? 'height:7px;bottom:1px;left:2px;right:' + (that.vScrollbar ? '7' : '2') + 'px' : 'width:7px;bottom:' + (that.hScrollbar ? '7' : '2') + 'px;top:2px;right:1px');

		bar.style.cssText += ';pointer-events:none;' + cssVendor + 'transition-property:opacity;' + cssVendor + 'transition-duration:' + (that.options.fadeScrollbar ? '350ms' : '0') + ';overflow:hidden;opacity:' + (that.options.hideScrollbar ? '0' : '1');

		that.wrapper.appendChild(bar);
		that[dir + 'ScrollbarWrapper'] = bar;

		// Create the scrollbar indicator
		bar = doc.createElement('div');
		if (!that.options.scrollbarClass) {
		    bar.style.cssText = 'position:absolute;z-index:100;background:rgba(0,0,0,0.5);border:1px solid rgba(255,255,255,0.9);' + cssVendor + 'background-clip:padding-box;' + cssVendor + 'box-sizing:border-box;' + (dir == 'h' ? 'height:100%' : 'width:100%') + ';' + cssVendor + 'border-radius:3px;border-radius:3px';
		}
		bar.style.cssText += ';pointer-events:none;' + cssVendor + 'transition-property:' + cssVendor + 'transform;' + cssVendor + 'transition-timing-function:cubic-bezier(0.33,0.66,0.66,1);' + cssVendor + 'transition-duration:0;' + cssVendor + 'transform: translate(0,0)' + translateZ;
		if (that.options.useTransition) bar.style.cssText += ';' + cssVendor + 'transition-timing-function:cubic-bezier(0.33,0.66,0.66,1)';

		that[dir + 'ScrollbarWrapper'].appendChild(bar);
		that[dir + 'ScrollbarIndicator'] = bar;
	    }

	    if (dir == 'h') {
		that.hScrollbarSize = that.hScrollbarWrapper.clientWidth;
		that.hScrollbarIndicatorSize = m.max(m.round(that.hScrollbarSize * that.hScrollbarSize / that.scrollerW), 8);
		that.hScrollbarIndicator.style.width = that.hScrollbarIndicatorSize + 'px';
		that.hScrollbarMaxScroll = that.hScrollbarSize - that.hScrollbarIndicatorSize;
		that.hScrollbarProp = that.hScrollbarMaxScroll / that.maxScrollX;
	    } else {
		that.vScrollbarSize = that.vScrollbarWrapper.clientHeight;
		that.vScrollbarIndicatorSize = m.max(m.round(that.vScrollbarSize * that.vScrollbarSize / that.scrollerH), 8);
		that.vScrollbarIndicator.style.height = that.vScrollbarIndicatorSize + 'px';
		that.vScrollbarMaxScroll = that.vScrollbarSize - that.vScrollbarIndicatorSize;
		that.vScrollbarProp = that.vScrollbarMaxScroll / that.maxScrollY;
	    }

	    // Reset position
	    that._scrollbarPos(dir, true);
	},
	
	_resize: function () {
	    var that = this;
	    setTimeout(function () {
		that.refresh();
	    }, isAndroid ? 200 : 0);
	},
	
	_pos: function (x, y) {
	    if (this.zoomed) return;

	    x = this.hScroll ? x : 0;
	    y = this.vScroll ? y : 0;

	    if (this.options.useTransform) {
		this.scroller.style[transform] = 'translate(' + x + 'px,' + y + 'px) scale(' + this.scale + ')' + translateZ;
	    } else {
		x = m.round(x);
		y = m.round(y);
		this.scroller.style.left = x + 'px';
		this.scroller.style.top = y + 'px';
	    }

	    this.x = x;
	    this.y = y;

	    this._scrollbarPos('h');
	    this._scrollbarPos('v');
	},

	_scrollbarPos: function (dir, hidden) {
	    var that = this,
	    pos = dir == 'h' ? that.x : that.y,
	    size;

	    if (!that[dir + 'Scrollbar']) return;

	    pos = that[dir + 'ScrollbarProp'] * pos;

	    if (pos < 0) {
		if (!that.options.fixedScrollbar) {
		    size = that[dir + 'ScrollbarIndicatorSize'] + m.round(pos * 3);
		    if (size < 8) size = 8;
		    that[dir + 'ScrollbarIndicator'].style[dir == 'h' ? 'width' : 'height'] = size + 'px';
		}
		pos = 0;
	    } else if (pos > that[dir + 'ScrollbarMaxScroll']) {
		if (!that.options.fixedScrollbar) {
		    size = that[dir + 'ScrollbarIndicatorSize'] - m.round((pos - that[dir + 'ScrollbarMaxScroll']) * 3);
		    if (size < 8) size = 8;
		    that[dir + 'ScrollbarIndicator'].style[dir == 'h' ? 'width' : 'height'] = size + 'px';
		    pos = that[dir + 'ScrollbarMaxScroll'] + (that[dir + 'ScrollbarIndicatorSize'] - size);
		} else {
		    pos = that[dir + 'ScrollbarMaxScroll'];
		}
	    }

	    that[dir + 'ScrollbarWrapper'].style[transitionDelay] = '0';
	    that[dir + 'ScrollbarWrapper'].style.opacity = hidden && that.options.hideScrollbar ? '0' : '1';
	    that[dir + 'ScrollbarIndicator'].style[transform] = 'translate(' + (dir == 'h' ? pos + 'px,0)' : '0,' + pos + 'px)') + translateZ;
	},
	
	_start: function (e) {
	    var that = this,
	    point = hasTouch ? e.touches[0] : e,
	    matrix, x, y,
	    c1, c2;

	    if (!that.enabled) return;

	    if (that.options.onBeforeScrollStart) that.options.onBeforeScrollStart.call(that, e);

	    if (that.options.useTransition || that.options.zoom) that._transitionTime(0);

	    that.moved = false;
	    that.animating = false;
	    that.zoomed = false;
	    that.distX = 0;
	    that.distY = 0;
	    that.absDistX = 0;
	    that.absDistY = 0;
	    that.dirX = 0;
	    that.dirY = 0;

	    // Gesture start
	    if (that.options.zoom && hasTouch && e.touches.length > 1) {
		c1 = m.abs(e.touches[0].pageX-e.touches[1].pageX);
		c2 = m.abs(e.touches[0].pageY-e.touches[1].pageY);
		that.touchesDistStart = m.sqrt(c1 * c1 + c2 * c2);

		that.originX = m.abs(e.touches[0].pageX + e.touches[1].pageX - that.wrapperOffsetLeft * 2) / 2 - that.x;
		that.originY = m.abs(e.touches[0].pageY + e.touches[1].pageY - that.wrapperOffsetTop * 2) / 2 - that.y;

		if (that.options.onZoomStart) that.options.onZoomStart.call(that, e);
	    }

	    if (that.options.momentum) {
		if (that.options.useTransform) {
		    // Very lame general purpose alternative to CSSMatrix
		    matrix = getComputedStyle(that.scroller, null)[transform].replace(/[^0-9\-.,]/g, '').split(',');
		    x = +matrix[4];
		    y = +matrix[5];
		} else {
		    x = +getComputedStyle(that.scroller, null).left.replace(/[^0-9-]/g, '');
		    y = +getComputedStyle(that.scroller, null).top.replace(/[^0-9-]/g, '');
		}
			
		if (x != that.x || y != that.y) {
		    if (that.options.useTransition) that._unbind(TRNEND_EV);
		    else cancelFrame(that.aniTime);
		    that.steps = [];
		    that._pos(x, y);
		    if (that.options.onScrollEnd) that.options.onScrollEnd.call(that);
		}
	    }

	    that.absStartX = that.x;	// Needed by snap threshold
	    that.absStartY = that.y;

	    that.startX = that.x;
	    that.startY = that.y;
	    that.pointX = point.pageX;
	    that.pointY = point.pageY;

	    that.startTime = e.timeStamp || Date.now();

	    if (that.options.onScrollStart) that.options.onScrollStart.call(that, e);

	    that._bind(MOVE_EV, window);
	    that._bind(END_EV, window);
	    that._bind(CANCEL_EV, window);
	},
	
	_move: function (e) {
	    var that = this,
	    point = hasTouch ? e.touches[0] : e,
	    deltaX = point.pageX - that.pointX,
	    deltaY = point.pageY - that.pointY,
	    newX = that.x + deltaX,
	    newY = that.y + deltaY,
	    c1, c2, scale,
	    timestamp = e.timeStamp || Date.now();

	    if (that.options.onBeforeScrollMove) that.options.onBeforeScrollMove.call(that, e);

	    // Zoom
	    if (that.options.zoom && hasTouch && e.touches.length > 1) {
		c1 = m.abs(e.touches[0].pageX - e.touches[1].pageX);
		c2 = m.abs(e.touches[0].pageY - e.touches[1].pageY);
		that.touchesDist = m.sqrt(c1*c1+c2*c2);

		that.zoomed = true;

		scale = 1 / that.touchesDistStart * that.touchesDist * this.scale;

		if (scale < that.options.zoomMin) scale = 0.5 * that.options.zoomMin * Math.pow(2.0, scale / that.options.zoomMin);
		else if (scale > that.options.zoomMax) scale = 2.0 * that.options.zoomMax * Math.pow(0.5, that.options.zoomMax / scale);

		that.lastScale = scale / this.scale;

		newX = this.originX - this.originX * that.lastScale + this.x,
		newY = this.originY - this.originY * that.lastScale + this.y;

		this.scroller.style[transform] = 'translate(' + newX + 'px,' + newY + 'px) scale(' + scale + ')' + translateZ;

		if (that.options.onZoom) that.options.onZoom.call(that, e);
		return;
	    }

	    that.pointX = point.pageX;
	    that.pointY = point.pageY;

	    // Slow down if outside of the boundaries
	    if (newX > 0 || newX < that.maxScrollX) {
		newX = that.options.bounce ? that.x + (deltaX / 2) : newX >= 0 || that.maxScrollX >= 0 ? 0 : that.maxScrollX;
	    }
	    if (newY > that.minScrollY || newY < that.maxScrollY) {
		newY = that.options.bounce ? that.y + (deltaY / 2) : newY >= that.minScrollY || that.maxScrollY >= 0 ? that.minScrollY : that.maxScrollY;
	    }

	    that.distX += deltaX;
	    that.distY += deltaY;
	    that.absDistX = m.abs(that.distX);
	    that.absDistY = m.abs(that.distY);

	    if (that.absDistX < 6 && that.absDistY < 6) {
		return;
	    }

	    // Lock direction
	    if (that.options.lockDirection) {
		if (that.absDistX > that.absDistY + 5) {
		    newY = that.y;
		    deltaY = 0;
		} else if (that.absDistY > that.absDistX + 5) {
		    newX = that.x;
		    deltaX = 0;
		}
	    }

	    that.moved = true;
	    that._pos(newX, newY);
	    that.dirX = deltaX > 0 ? -1 : deltaX < 0 ? 1 : 0;
	    that.dirY = deltaY > 0 ? -1 : deltaY < 0 ? 1 : 0;

	    if (timestamp - that.startTime > 300) {
		that.startTime = timestamp;
		that.startX = that.x;
		that.startY = that.y;
	    }
		
	    if (that.options.onScrollMove) that.options.onScrollMove.call(that, e);
	},
	
	_end: function (e) {
	    if (hasTouch && e.touches.length !== 0) return;

	    var that = this,
	    point = hasTouch ? e.changedTouches[0] : e,
	    target, ev,
	    momentumX = {
		dist:0, 
		time:0
	    },
	    momentumY = {
		dist:0, 
		time:0
	    },
	    duration = (e.timeStamp || Date.now()) - that.startTime,
	    newPosX = that.x,
	    newPosY = that.y,
	    distX, distY,
	    newDuration,
	    snap,
	    scale;

	    that._unbind(MOVE_EV, window);
	    that._unbind(END_EV, window);
	    that._unbind(CANCEL_EV, window);

	    if (that.options.onBeforeScrollEnd) that.options.onBeforeScrollEnd.call(that, e);

	    if (that.zoomed) {
		scale = that.scale * that.lastScale;
		scale = Math.max(that.options.zoomMin, scale);
		scale = Math.min(that.options.zoomMax, scale);
		that.lastScale = scale / that.scale;
		that.scale = scale;

		that.x = that.originX - that.originX * that.lastScale + that.x;
		that.y = that.originY - that.originY * that.lastScale + that.y;
			
		that.scroller.style[transitionDuration] = '200ms';
		that.scroller.style[transform] = 'translate(' + that.x + 'px,' + that.y + 'px) scale(' + that.scale + ')' + translateZ;
			
		that.zoomed = false;
		that.refresh();

		if (that.options.onZoomEnd) that.options.onZoomEnd.call(that, e);
		return;
	    }

	    if (!that.moved) {
		if (hasTouch) {
		    if (that.doubleTapTimer && that.options.zoom) {
			// Double tapped
			clearTimeout(that.doubleTapTimer);
			that.doubleTapTimer = null;
			if (that.options.onZoomStart) that.options.onZoomStart.call(that, e);
			that.zoom(that.pointX, that.pointY, that.scale == 1 ? that.options.doubleTapZoom : 1);
			if (that.options.onZoomEnd) {
			    setTimeout(function() {
				that.options.onZoomEnd.call(that, e);
			    }, 200); // 200 is default zoom duration
			}
		    } else if (this.options.handleClick) {
			that.doubleTapTimer = setTimeout(function () {
			    that.doubleTapTimer = null;

			    // Find the last touched element
			    target = point.target;
			    while (target.nodeType != 1) target = target.parentNode;

			    if (target.tagName != 'SELECT' && target.tagName != 'INPUT' && target.tagName != 'TEXTAREA') {
				ev = doc.createEvent('MouseEvents');
				ev.initMouseEvent('click', true, true, e.view, 1,
				    point.screenX, point.screenY, point.clientX, point.clientY,
				    e.ctrlKey, e.altKey, e.shiftKey, e.metaKey,
				    0, null);
				ev._fake = true;
				target.dispatchEvent(ev);
			    }
			}, that.options.zoom ? 250 : 0);
		    }
		}

		that._resetPos(400);

		if (that.options.onTouchEnd) that.options.onTouchEnd.call(that, e);
		return;
	    }

	    if (duration < 300 && that.options.momentum) {
		momentumX = newPosX ? that._momentum(newPosX - that.startX, duration, -that.x, that.scrollerW - that.wrapperW + that.x, that.options.bounce ? that.wrapperW : 0) : momentumX;
		momentumY = newPosY ? that._momentum(newPosY - that.startY, duration, -that.y, (that.maxScrollY < 0 ? that.scrollerH - that.wrapperH + that.y - that.minScrollY : 0), that.options.bounce ? that.wrapperH : 0) : momentumY;

		newPosX = that.x + momentumX.dist;
		newPosY = that.y + momentumY.dist;

		if ((that.x > 0 && newPosX > 0) || (that.x < that.maxScrollX && newPosX < that.maxScrollX)) momentumX = {
		    dist:0, 
		    time:0
		};
		if ((that.y > that.minScrollY && newPosY > that.minScrollY) || (that.y < that.maxScrollY && newPosY < that.maxScrollY)) momentumY = {
		    dist:0, 
		    time:0
		};
	    }

	    if (momentumX.dist || momentumY.dist) {
		newDuration = m.max(m.max(momentumX.time, momentumY.time), 10);

		// Do we need to snap?
		if (that.options.snap) {
		    distX = newPosX - that.absStartX;
		    distY = newPosY - that.absStartY;
		    if (m.abs(distX) < that.options.snapThreshold && m.abs(distY) < that.options.snapThreshold) {
			that.scrollTo(that.absStartX, that.absStartY, 200);
		    }
		    else {
			snap = that._snap(newPosX, newPosY);
			newPosX = snap.x;
			newPosY = snap.y;
			newDuration = m.max(snap.time, newDuration);
		    }
		}

		that.scrollTo(m.round(newPosX), m.round(newPosY), newDuration);

		if (that.options.onTouchEnd) that.options.onTouchEnd.call(that, e);
		return;
	    }

	    // Do we need to snap?
	    if (that.options.snap) {
		distX = newPosX - that.absStartX;
		distY = newPosY - that.absStartY;
		if (m.abs(distX) < that.options.snapThreshold && m.abs(distY) < that.options.snapThreshold) that.scrollTo(that.absStartX, that.absStartY, 200);
		else {
		    snap = that._snap(that.x, that.y);
		    if (snap.x != that.x || snap.y != that.y) that.scrollTo(snap.x, snap.y, snap.time);
		}

		if (that.options.onTouchEnd) that.options.onTouchEnd.call(that, e);
		return;
	    }

	    that._resetPos(200);
	    if (that.options.onTouchEnd) that.options.onTouchEnd.call(that, e);
	},
	
	_resetPos: function (time) {
	    var that = this,
	    resetX = that.x >= 0 ? 0 : that.x < that.maxScrollX ? that.maxScrollX : that.x,
	    resetY = that.y >= that.minScrollY || that.maxScrollY > 0 ? that.minScrollY : that.y < that.maxScrollY ? that.maxScrollY : that.y;

	    if (resetX == that.x && resetY == that.y) {
		if (that.moved) {
		    that.moved = false;
		    if (that.options.onScrollEnd) that.options.onScrollEnd.call(that);		// Execute custom code on scroll end
		}

		if (that.hScrollbar && that.options.hideScrollbar) {
		    if (vendor == 'webkit') that.hScrollbarWrapper.style[transitionDelay] = '300ms';
		    that.hScrollbarWrapper.style.opacity = '0';
		}
		if (that.vScrollbar && that.options.hideScrollbar) {
		    if (vendor == 'webkit') that.vScrollbarWrapper.style[transitionDelay] = '300ms';
		    that.vScrollbarWrapper.style.opacity = '0';
		}

		return;
	    }

	    that.scrollTo(resetX, resetY, time || 0);
	},

	_wheel: function (e) {
	    var that = this,
	    wheelDeltaX, wheelDeltaY,
	    deltaX, deltaY,
	    deltaScale;

	    if ('wheelDeltaX' in e) {
		wheelDeltaX = e.wheelDeltaX / 12;
		wheelDeltaY = e.wheelDeltaY / 12;
	    } else if('wheelDelta' in e) {
		wheelDeltaX = wheelDeltaY = e.wheelDelta / 12;
	    } else if ('detail' in e) {
		wheelDeltaX = wheelDeltaY = -e.detail * 3;
	    } else {
		return;
	    }
		
	    if (that.options.wheelAction == 'zoom') {
		deltaScale = that.scale * Math.pow(2, 1/3 * (wheelDeltaY ? wheelDeltaY / Math.abs(wheelDeltaY) : 0));
		if (deltaScale < that.options.zoomMin) deltaScale = that.options.zoomMin;
		if (deltaScale > that.options.zoomMax) deltaScale = that.options.zoomMax;
			
		if (deltaScale != that.scale) {
		    if (!that.wheelZoomCount && that.options.onZoomStart) that.options.onZoomStart.call(that, e);
		    that.wheelZoomCount++;
				
		    that.zoom(e.pageX, e.pageY, deltaScale, 400);
				
		    setTimeout(function() {
			that.wheelZoomCount--;
			if (!that.wheelZoomCount && that.options.onZoomEnd) that.options.onZoomEnd.call(that, e);
		    }, 400);
		}
			
		return;
	    }
		
	    deltaX = that.x + wheelDeltaX;
	    deltaY = that.y + wheelDeltaY;

	    if (deltaX > 0) deltaX = 0;
	    else if (deltaX < that.maxScrollX) deltaX = that.maxScrollX;

	    if (deltaY > that.minScrollY) deltaY = that.minScrollY;
	    else if (deltaY < that.maxScrollY) deltaY = that.maxScrollY;
    
	    if (that.maxScrollY < 0) {
		that.scrollTo(deltaX, deltaY, 0);
	    }
	},
	
	_transitionEnd: function (e) {
	    var that = this;

	    if (e.target != that.scroller) return;

	    that._unbind(TRNEND_EV);
		
	    that._startAni();
	},


	/**
	*
	* Utilities
	*
	*/
	_startAni: function () {
	    var that = this,
	    startX = that.x, startY = that.y,
	    startTime = Date.now(),
	    step, easeOut,
	    animate;

	    if (that.animating) return;
		
	    if (!that.steps.length) {
		that._resetPos(400);
		return;
	    }
		
	    step = that.steps.shift();
		
	    if (step.x == startX && step.y == startY) step.time = 0;

	    that.animating = true;
	    that.moved = true;
		
	    if (that.options.useTransition) {
		that._transitionTime(step.time);
		that._pos(step.x, step.y);
		that.animating = false;
		if (step.time) that._bind(TRNEND_EV);
		else that._resetPos(0);
		return;
	    }

	    animate = function () {
		var now = Date.now(),
		newX, newY;

		if (now >= startTime + step.time) {
		    that._pos(step.x, step.y);
		    that.animating = false;
		    if (that.options.onAnimationEnd) that.options.onAnimationEnd.call(that);			// Execute custom code on animation end
		    that._startAni();
		    return;
		}

		now = (now - startTime) / step.time - 1;
		easeOut = m.sqrt(1 - now * now);
		newX = (step.x - startX) * easeOut + startX;
		newY = (step.y - startY) * easeOut + startY;
		that._pos(newX, newY);
		if (that.animating) that.aniTime = nextFrame(animate);
	    };

	    animate();
	},

	_transitionTime: function (time) {
	    time += 'ms';
	    this.scroller.style[transitionDuration] = time;
	    if (this.hScrollbar) this.hScrollbarIndicator.style[transitionDuration] = time;
	    if (this.vScrollbar) this.vScrollbarIndicator.style[transitionDuration] = time;
	},

	_momentum: function (dist, time, maxDistUpper, maxDistLower, size) {
	    var deceleration = 0.0006,
	    speed = m.abs(dist) / time,
	    newDist = (speed * speed) / (2 * deceleration),
	    newTime = 0, outsideDist = 0;

	    // Proportinally reduce speed if we are outside of the boundaries
	    if (dist > 0 && newDist > maxDistUpper) {
		outsideDist = size / (6 / (newDist / speed * deceleration));
		maxDistUpper = maxDistUpper + outsideDist;
		speed = speed * maxDistUpper / newDist;
		newDist = maxDistUpper;
	    } else if (dist < 0 && newDist > maxDistLower) {
		outsideDist = size / (6 / (newDist / speed * deceleration));
		maxDistLower = maxDistLower + outsideDist;
		speed = speed * maxDistLower / newDist;
		newDist = maxDistLower;
	    }

	    newDist = newDist * (dist < 0 ? -1 : 1);
	    newTime = speed / deceleration;

	    return {
		dist: newDist, 
		time: m.round(newTime)
	    };
	},

	_offset: function (el) {
	    var left = -el.offsetLeft,
	    top = -el.offsetTop;
			
	    while (el = el.offsetParent) {
		left -= el.offsetLeft;
		top -= el.offsetTop;
	    }
		
	    if (el != this.wrapper) {
		left *= this.scale;
		top *= this.scale;
	    }

	    return {
		left: left, 
		top: top
	    };
	},

	_snap: function (x, y) {
	    var that = this,
	    i, l,
	    page, time,
	    sizeX, sizeY;

	    // Check page X
	    page = that.pagesX.length - 1;
	    for (i=0, l=that.pagesX.length; i<l; i++) {
		if (x >= that.pagesX[i]) {
		    page = i;
		    break;
		}
	    }
	    if (page == that.currPageX && page > 0 && that.dirX < 0) page--;
	    x = that.pagesX[page];
	    sizeX = m.abs(x - that.pagesX[that.currPageX]);
	    sizeX = sizeX ? m.abs(that.x - x) / sizeX * 500 : 0;
	    that.currPageX = page;

	    // Check page Y
	    page = that.pagesY.length-1;
	    for (i=0; i<page; i++) {
		if (y >= that.pagesY[i]) {
		    page = i;
		    break;
		}
	    }
	    if (page == that.currPageY && page > 0 && that.dirY < 0) page--;
	    y = that.pagesY[page];
	    sizeY = m.abs(y - that.pagesY[that.currPageY]);
	    sizeY = sizeY ? m.abs(that.y - y) / sizeY * 500 : 0;
	    that.currPageY = page;

	    // Snap with constant speed (proportional duration)
	    time = m.round(m.max(sizeX, sizeY)) || 200;

	    return {
		x: x, 
		y: y, 
		time: time
	    };
	},

	_bind: function (type, el, bubble) {
	    (el || this.scroller).addEventListener(type, this, !!bubble);
	},

	_unbind: function (type, el, bubble) {
	    (el || this.scroller).removeEventListener(type, this, !!bubble);
	},


	/**
	*
	* Public methods
	*
	*/
	destroy: function () {
	    var that = this;

	    that.scroller.style[transform] = '';

	    // Remove the scrollbars
	    that.hScrollbar = false;
	    that.vScrollbar = false;
	    that._scrollbar('h');
	    that._scrollbar('v');

	    // Remove the event listeners
	    that._unbind(RESIZE_EV, window);
	    that._unbind(START_EV);
	    that._unbind(MOVE_EV, window);
	    that._unbind(END_EV, window);
	    that._unbind(CANCEL_EV, window);
		
	    if (!that.options.hasTouch) {
		that._unbind(WHEEL_EV);
	    }
		
	    if (that.options.useTransition) that._unbind(TRNEND_EV);
		
	    if (that.options.checkDOMChanges) clearInterval(that.checkDOMTime);
		
	    if (that.options.onDestroy) that.options.onDestroy.call(that);
	},

	refresh: function () {
	    var that = this,
	    offset,
	    i, l,
	    els,
	    pos = 0,
	    page = 0;

	    if (that.scale < that.options.zoomMin) that.scale = that.options.zoomMin;
	    that.wrapperW = that.wrapper.clientWidth || 1;
	    that.wrapperH = that.wrapper.clientHeight || 1;

	    that.minScrollY = -that.options.topOffset || 0;
	    that.scrollerW = m.round(that.scroller.offsetWidth * that.scale);
	    that.scrollerH = m.round((that.scroller.offsetHeight + that.minScrollY) * that.scale);
	    that.maxScrollX = that.wrapperW - that.scrollerW;
	    that.maxScrollY = that.wrapperH - that.scrollerH + that.minScrollY;
	    that.dirX = 0;
	    that.dirY = 0;

	    if (that.options.onRefresh) that.options.onRefresh.call(that);

	    that.hScroll = that.options.hScroll && that.maxScrollX < 0;
	    that.vScroll = that.options.vScroll && (!that.options.bounceLock && !that.hScroll || that.scrollerH > that.wrapperH);

	    that.hScrollbar = that.hScroll && that.options.hScrollbar;
	    that.vScrollbar = that.vScroll && that.options.vScrollbar && that.scrollerH > that.wrapperH;

	    offset = that._offset(that.wrapper);
	    that.wrapperOffsetLeft = -offset.left;
	    that.wrapperOffsetTop = -offset.top;

	    // Prepare snap
	    if (typeof that.options.snap == 'string') {
		that.pagesX = [];
		that.pagesY = [];
		els = that.scroller.querySelectorAll(that.options.snap);
		for (i=0, l=els.length; i<l; i++) {
		    pos = that._offset(els[i]);
		    pos.left += that.wrapperOffsetLeft;
		    pos.top += that.wrapperOffsetTop;
		    that.pagesX[i] = pos.left < that.maxScrollX ? that.maxScrollX : pos.left * that.scale;
		    that.pagesY[i] = pos.top < that.maxScrollY ? that.maxScrollY : pos.top * that.scale;
		}
	    } else if (that.options.snap) {
		that.pagesX = [];
		while (pos >= that.maxScrollX) {
		    that.pagesX[page] = pos;
		    pos = pos - that.wrapperW;
		    page++;
		}
		if (that.maxScrollX%that.wrapperW) that.pagesX[that.pagesX.length] = that.maxScrollX - that.pagesX[that.pagesX.length-1] + that.pagesX[that.pagesX.length-1];

		pos = 0;
		page = 0;
		that.pagesY = [];
		while (pos >= that.maxScrollY) {
		    that.pagesY[page] = pos;
		    pos = pos - that.wrapperH;
		    page++;
		}
		if (that.maxScrollY%that.wrapperH) that.pagesY[that.pagesY.length] = that.maxScrollY - that.pagesY[that.pagesY.length-1] + that.pagesY[that.pagesY.length-1];
	    }

	    // Prepare the scrollbars
	    that._scrollbar('h');
	    that._scrollbar('v');

	    if (!that.zoomed) {
		that.scroller.style[transitionDuration] = '0';
		that._resetPos(400);
	    }
	},

	scrollTo: function (x, y, time, relative) {
	    var that = this,
	    step = x,
	    i, l;

	    that.stop();

	    if (!step.length) step = [{
		x: x, 
		y: y, 
		time: time, 
		relative: relative
	    }];
		
	    for (i=0, l=step.length; i<l; i++) {
		if (step[i].relative) {
		    step[i].x = that.x - step[i].x;
		    step[i].y = that.y - step[i].y;
		}
		that.steps.push({
		    x: step[i].x, 
		    y: step[i].y, 
		    time: step[i].time || 0
		});
	    }

	    that._startAni();
	},

	scrollToElement: function (el, time) {
	    var that = this, pos;
	    el = el.nodeType ? el : that.scroller.querySelector(el);
	    if (!el) return;

	    pos = that._offset(el);
	    pos.left += that.wrapperOffsetLeft;
	    pos.top += that.wrapperOffsetTop;

	    pos.left = pos.left > 0 ? 0 : pos.left < that.maxScrollX ? that.maxScrollX : pos.left;
	    pos.top = pos.top > that.minScrollY ? that.minScrollY : pos.top < that.maxScrollY ? that.maxScrollY : pos.top;
	    time = time === undefined ? m.max(m.abs(pos.left)*2, m.abs(pos.top)*2) : time;

	    that.scrollTo(pos.left, pos.top, time);
	},

	scrollToPage: function (pageX, pageY, time) {
	    var that = this, x, y;
		
	    time = time === undefined ? 400 : time;

	    if (that.options.onScrollStart) that.options.onScrollStart.call(that);

	    if (that.options.snap) {
		pageX = pageX == 'next' ? that.currPageX+1 : pageX == 'prev' ? that.currPageX-1 : pageX;
		pageY = pageY == 'next' ? that.currPageY+1 : pageY == 'prev' ? that.currPageY-1 : pageY;

		pageX = pageX < 0 ? 0 : pageX > that.pagesX.length-1 ? that.pagesX.length-1 : pageX;
		pageY = pageY < 0 ? 0 : pageY > that.pagesY.length-1 ? that.pagesY.length-1 : pageY;

		that.currPageX = pageX;
		that.currPageY = pageY;
		x = that.pagesX[pageX];
		y = that.pagesY[pageY];
	    } else {
		x = -that.wrapperW * pageX;
		y = -that.wrapperH * pageY;
		if (x < that.maxScrollX) x = that.maxScrollX;
		if (y < that.maxScrollY) y = that.maxScrollY;
	    }

	    that.scrollTo(x, y, time);
	},

	disable: function () {
	    this.stop();
	    this._resetPos(0);
	    this.enabled = false;

	    // If disabled after touchstart we make sure that there are no left over events
	    this._unbind(MOVE_EV, window);
	    this._unbind(END_EV, window);
	    this._unbind(CANCEL_EV, window);
	},
	
	enable: function () {
	    this.enabled = true;
	},
	
	stop: function () {
	    if (this.options.useTransition) this._unbind(TRNEND_EV);
	    else cancelFrame(this.aniTime);
	    this.steps = [];
	    this.moved = false;
	    this.animating = false;
	},
	
	zoom: function (x, y, scale, time) {
	    var that = this,
	    relScale = scale / that.scale;

	    if (!that.options.useTransform) return;

	    that.zoomed = true;
	    time = time === undefined ? 200 : time;
	    x = x - that.wrapperOffsetLeft - that.x;
	    y = y - that.wrapperOffsetTop - that.y;
	    that.x = x - x * relScale + that.x;
	    that.y = y - y * relScale + that.y;

	    that.scale = scale;
	    that.refresh();

	    that.x = that.x > 0 ? 0 : that.x < that.maxScrollX ? that.maxScrollX : that.x;
	    that.y = that.y > that.minScrollY ? that.minScrollY : that.y < that.maxScrollY ? that.maxScrollY : that.y;

	    that.scroller.style[transitionDuration] = time + 'ms';
	    that.scroller.style[transform] = 'translate(' + that.x + 'px,' + that.y + 'px) scale(' + scale + ')' + translateZ;
	    that.zoomed = false;
	},
	
	isReady: function () {
	    return !this.moved && !this.zoomed && !this.animating;
	}
    };

    function prefixStyle (style) {
	if ( vendor === '' ) return style;

	style = style.charAt(0).toUpperCase() + style.substr(1);
	return vendor + style;
    }

    dummyStyle = null;	// for the sake of it

    if (typeof exports !== 'undefined') exports.iScroll = iScroll;
    else window.iScroll = iScroll;

})(window, document);
